diff --git a/scripts/build_runtime.py b/scripts/build_runtime.py
index 8a676bd..754e03e 100644
--- a/scripts/build_runtime.py
+++ b/scripts/build_runtime.py
@@ -211,7 +211,9 @@ def ensure_angle():
     if platform.system() == "Windows":
         checkfiles = [
             "milepost/lib/libEGL.dll",
+            "milepost/lib/libEGL.dll.lib",
             "milepost/lib/libGLESv2.dll",
+            "milepost/lib/libGLESv2.dll.lib",
         ]
     elif platform.system() == "Darwin":
         if platform.machine() == "arm64":
@@ -245,11 +247,11 @@ def download_angle():
     print("Downloading ANGLE...")
     if platform.system() == "Windows":
         build = "windows-2019"
-        extension = "dll"
+        extensions = ["dll", "lib"]
     elif platform.system() == "Darwin":
         # TODO(ben): make universal dylibs
         build = "macos-12"
-        extension = "dylib"
+        extensions = ["dylib"]
     else:
         log_error(f"could not automatically download ANGLE for unknown platform {platform.system()}")
         return
@@ -270,9 +272,11 @@ def download_angle():
     with ZipFile(filepath, "r") as anglezip:
         anglezip.extractall(path="scripts/files")
 
-    for filepath in glob.glob(f"scripts/files/angle/bin/*.{extension}"):
-        os.makedirs("milepost/lib", exist_ok=True)
-        shutil.copy(filepath, "milepost/lib")
+    os.makedirs("milepost/lib", exist_ok=True)
+    for angleDir in ["bin", "lib"]:
+        for ext in extensions:
+            for filepath in glob.glob(f"scripts/files/angle/{angleDir}/*.{ext}"):
+                shutil.copy(filepath, "milepost/lib")
 
 
 def embed_text_glsl(outputpath, prefix, shaders):